// @file
// @author TPOC: contact@palisade-crypto.org
//
// @copyright Copyright (c) 2019, New Jersey Institute of Technology (NJIT)
// All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution. THIS SOFTWARE IS
// PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
// EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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#include <iostream>
#include <vector>
#include "gtest/gtest.h"

#include "cryptocontext.h"

#include "encoding/encodings.h"

#include "utils/debug.h"
#include "utils/parmfactory.h"

using namespace std;
using namespace lbcrypto;

class UTBGVDCRT : public ::testing::Test {
 protected:
  void SetUp() {}

  void TearDown() {
    CryptoContextFactory<Poly>::ReleaseAllContexts();
    CryptoContextFactory<DCRTPoly>::ReleaseAllContexts();
  }

 public:
};

// FIXME this test might be redundant in other files; perhaps this entire file
// can go

#if !defined(_MSC_VER)
TEST_F(UTBGVDCRT, Poly_bgv_DCRT_MODREDUCE) {
  usint m = 8;

  usint numOfTower = 3;

  PlaintextModulus plaintextModulus = 8;

  float stdDev = 4;

  shared_ptr<ILDCRTParams<BigInteger>> params =
      GenerateDCRTParams<BigInteger>(m, numOfTower, 48);

  CryptoContext<DCRTPoly> cc =
      CryptoContextFactory<DCRTPoly>::genCryptoContextBGV(
          params, plaintextModulus, m, stdDev);
  cc->Enable(ENCRYPTION);
  cc->Enable(SHE);
  cc->Enable(LEVELEDSHE);

  // Initialize the public key containers.
  LPKeyPair<DCRTPoly> kp = cc->KeyGen();

  std::vector<int64_t> vectorOfInts1 = {4, 1, 2, 3};

  Plaintext intArray1 = cc->MakeCoefPackedPlaintext(vectorOfInts1);
  Plaintext intArrayNew;

  ////////////////////////////////////////////////////////////
  // Encryption
  ////////////////////////////////////////////////////////////

  Ciphertext<DCRTPoly> ciphertext = cc->Encrypt(kp.publicKey, intArray1);

  cc->Decrypt(kp.secretKey, ciphertext, &intArrayNew);
  EXPECT_EQ(intArray1->GetCoefPackedValue(), intArrayNew->GetCoefPackedValue())
      << "Decrypt without ModReduce fails";

  Ciphertext<DCRTPoly> ciphertextR = cc->ModReduce(ciphertext);

  // drop a tower from the secret key

  auto skEl(kp.secretKey->GetPrivateElement());
  skEl.DropLastElement();
  kp.secretKey->SetPrivateElement(skEl);

  Plaintext intArrayNew2;
  cc->Decrypt(kp.secretKey, ciphertextR, &intArrayNew2);
  intArrayNew2->SetLength(intArray1->GetLength());

  EXPECT_EQ(intArray1->GetCoefPackedValue(), intArrayNew2->GetCoefPackedValue())
      << "Decrypt after ModReduce fails";
}
#endif
